// Scintilla source code edit control
/** @file ContractionState.h
 ** Manages visibility of lines for folding and wrapping.
 **/
// Copyright 1998-2007 by Neil Hodgson <neilh@scintilla.org>
// The License.txt file describes the conditions under which this software may be distributed.

#ifndef CONTRACTIONSTATE_H
#define CONTRACTIONSTATE_H

#ifdef SCI_NAMESPACE
namespace Scintilla {
#endif

/**
 */
class ContractionState {
    // These contain 1 element for every document line.
    RunStyles *visible;
    RunStyles *expanded;
    RunStyles *heights;
    Partitioning *displayLines;
    int linesInDocument;

    void EnsureData();

    bool OneToOne() const {
        // True when each document line is exactly one display line so need for
        // complex data structures.
        return visible == 0;
    }

public:
    ContractionState();
    virtual ~ContractionState();

    void Clear();

    int LinesInDoc() const;
    int LinesDisplayed() const;
    int DisplayFromDoc(int lineDoc) const;
    int DocFromDisplay(int lineDisplay) const;

    void InsertLine(int lineDoc);
    void InsertLines(int lineDoc, int lineCount);
    void DeleteLine(int lineDoc);
    void DeleteLines(int lineDoc, int lineCount);

    bool GetVisible(int lineDoc) const;
    bool SetVisible(int lineDocStart, int lineDocEnd, bool visible);

    bool GetExpanded(int lineDoc) const;
    bool SetExpanded(int lineDoc, bool expanded);
    int ContractedNext(int lineDocStart) const;

    int GetHeight(int lineDoc) const;
    bool SetHeight(int lineDoc, int height);

    void ShowAll();
    void Check() const;
};

#ifdef SCI_NAMESPACE
}
#endif

#endif
